Public bug reported:
[Impact]
* In multi-queue configurations for qlcnic driver, there is a corner case
in which TX queue zero is used at same time for regular data transmission
by one CPU while another uses the same queue descriptor for MAC configuration.
* When such "race" indeed happens, it could lead to TX queue zero corruption,
triggering as net result firmware aborts/hangs out of nowhere. The following
kernel log messages were collected during the corruption event:
qlcnic 0000:01:00.0: Pause control frames disabled on all ports
qlcnic 0000:01:00.0: firmware hang detected
qlcnic 0000:01:00.0: Dumping hw/fw registers
PEG_HALT_STATUS1: 0x40001502, PEG_HALT_STATUS2: 0x3de7a0,
PEG_NET_0_PC: 0x6d268, PEG_NET_1_PC: 0x6d2ac,
PEG_NET_2_PC: 0x149, PEG_NET_3_PC: 0x6e105,
PEG_NET_4_PC: 0x1e00b
[...]
qlcnic 0000:01:00.0: Detected state change from DEV_NEED_RESET, skipping ack
check
* The following device is known to suffer from the issue (lspci output),
although a whole class of devices (named 82XX series from the vendor) are
susceptible to this:
01:00.0 Ethernet controller [0200]: QLogic Corp. cLOM8214 1/10GbE Controller
[1077:8020]
* The fix is the following patch, present in mainline kernel as well as
in supported stable branches:
c333fa0c4f22 ("qlcnic: fix Tx descriptor corruption on 82xx devices").
Link for the patch in Linus tree: http://git.kernel.org/linus/c333fa0c4f22
[Test Case]
* Unfortunately this is not easy to reproduce; we have a user report of
the issue with a pretty reliable reproducer - user is running a NFS
workload on top of the above PCI adapter. His problem goes away with
the patch proposed here to SRU. His problem happens in both kernels 4.4
and 4.15, and the patch fixes it for both of them.
(Notice this is a Bionic-only SRU, since Ubuntu 4.4 kernel got the patch
from Greg's supported stable branch).
[Regression Potential]
* The patch scope is restricted to a single driver, and the code itself
is self-contained - basically a restriction to specific tx_ring when
setting filters. There is potential for regressions in this path for
the driver which could cause different firmware issues for example,
but the user testing exhibited great reliability - without the patch
issue happens after ~6h of machine boot. With the patch the machine ran
for more than 8 days without issues.
* Also the patch is present in mainline kernel as well as supported
stable branches, and is already present in Ubuntu 4.4 kernel.
** Affects: linux (Ubuntu)
Importance: High
Assignee: Guilherme G. Piccoli (gpiccoli)
Status: Confirmed
** Tags: sts
** Summary changed:
- qlcnic: Firmware aborts/hangs in QLogic NIC (qlcnic driver)
+ qlcnic: Firmware aborts/hangs in QLogic NIC
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https://bugs.launchpad.net/bugs/1815033
Title:
qlcnic: Firmware aborts/hangs in QLogic NIC
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